Burglar-alarm for windows.



No. 688,825. Patented Dec. 17, I90L- H. G. CLARK. 1 BURGLAB ALARM FOR WINDOWS.

(Application filed Aug 20, 1901.

(No Model.)

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BURGLAR ALARll/l FOR INDOWS.

SPECIFICATION forming part of letters Patent No. 688,825, dated December 1'7, 1901.

Application filed August 20, 1901. Serial No. 72,677, (No model.)

To all whom it may concern:

Be it known that I, HORACE G. OLARK,a citi zen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Burglar-Alarms for Windows, of which the following is a specification.

This invention relates to improvements in burglar-alarms for windows, the object of my invention being to provide an alarm which can be readily applied and thrown in and out of operation when desired.

In the accompanying drawings, Figure 1 is a perspective view showing my invention applied to a window; and Fig. 2 is a plan view, the bell being partly broken away.

A refers to the upper sash of a window, and to one of the vertical side bars thereof there is attached an angle-bar a. The alarm proper is designed to be attached to one end of the upper horizontal bar B of the lower sash, and said alarm comprises a bell or gong C, which is mounted on a stem 0, having a wheel d, adjacent to which is pivoted a pallet to which the arm of the bell-hammer is rigidly secured. The stem 0 is driven by a suitable spring which may be wound up by turning a key g, attached to the upper end of the stem beyond the gong, or by turning the gong when the same is fast on the stem. When the spring is wound up, the wheel (Z will be turned, and it will oscillate'the bell-hammer unless the same is restrained. The base C, which is fastened to the upper rail of the lower window-sash, is recessed beneath the gong and bell-hammer to receive the coiled actuating spring, and to the corners of the block are attached guides h h, through which passes a rod D, one end of the rod being rounded to provide a shoulder against which one end of a coiled spring will abut, the other end of the spring bearing against the guide-plate h. The rectangular portion of the bar has an offset a, which when in engagement with the bellhammer will prevent movement thereof, and adjacent to the guide h is a notch or recess 7a, which may be caught in said guide when the bar D is moved to its full extent in one direction, so as to hold the spring compressed and the bar out of an operative position. The

end of the bar D is bifurcated, and pivoted thereto, so as to swing either upward or downward, is a pawl D, which when placed on a line with the bar D will engage the angleplate a of the upper sash.

In operation when the spring, which is of the usual type, is wound up the notch 73, near the end of the latch-bar D, is placed in en-' gagement with the guide h. This locates the extension or lug on the latch-bar in the path of the bell-hammer and prevents movement of the same. By placing the pawl D in a horizontal position and releasing the notch said pawl will be moved by the spring in engagement with the angle-bar and will be held until either the upper or lower sash is moved, when the pawl will be swung on its pivot, the bar then moving under the pressure of the spring to force the lug out of the path of the bell-hammer, so that an alarm will be sounded when the sashes are moved.

The device illustrated may be modified as to the construction, and any suitable means may be used for actuating the bell=hammer. By the arrangement shown the alarm protects both sashes, the angle-bar may be dispensed with, and the base may be positioned so that the pawl or movable member of the bar 13 will engage directly with the sash.

I claim- 1. In a burglar-alarm for windows, the combination of a'base which carries a-bell and a spring-actuated bell-hammer, means for lock in g the bell-hammer consisting of a longitudinally-movable bar, a spring for moving said bar in one direction, guides attached to the base through which the bar is passed, said bar having between the guides and in the path of the bell-hammer a projecting portion and to one side of the projecting portion a recess and a pawl or swinging member which is pivotally attached to the bar and adapted when in line therewith to engage a sash-frame or an abutment carried thereby, so as to hold the bar against the action of the spring, substantially as shown.

2. In combination with the upper and lower sashes of a window-frame,the upper sash having attached thereto an outwardly-projecting bar, of an alarm carried by the upper horizontal rail of the lower sash, said alarm eom- In testimony whereof I have hereunto set prisingaspring-actuatedbell-hammer, agong my hand in presence of two subscribing wit- 10 and a spring-actuated blzlu' having a projectnesses. I I 7 ing portion which when t e spring is retracted 5 lies in the path of the bell-hammer, a notch HORACE or recess in said bar and a swinging member Witnesses: or pawl at the end of the bar, substantially GEORGE W. YAUST, as shown; HENRY J. GILL. 

